Trouble connecting iMac to stereo receiver

For the past couple of years I've been playing the MP3s on my G5 iMac through a Sony receiver (STR-DE197) with home stereo speakers. I use an RCA connector to connect the computer's audio output jack to the receiver. Last night, I unplugged the receiver for a few minutes, and when I plugged it back in, there was no sound. I know that there's nothing wrong with the receiver, because I can still listen to my iPod through it without any problems. I'm pretty sure there's nothing wrong with the RCA connector or with the receiver's input jacks, for the same reason. The computer's audio output also seems fine. I can still listen to music through headphones plugged into the audio output jack. Yet for some reason I can't get anything to come through the receiver, and it's driving me crazy. Any help would be hugely appreciated! thanks.

So if you connect your iPod to the same connector that you plug into the iMac, the stereo works. If you connect earbuds to the iMac's audio output, they work. But if you connect that same connector that goes to the stereo to the iMac's audio output, it does not work? Very strange...
First, make sure you did mistakenly connect it to the iMac's audio input port by mistake.
Also, go to the System Preferences Sound pane Output tab. On the list of sound output devices, when you connect the jack into the audio output port, the Name should change from +Internal Speakers+ to Headphones. So make sure the system acknowledges you plugged something into the port. The OS stores the volume level for Internal Speakers separately from Headphones, so make sure the setting for Headphones did not get set to Mute somehow.
Sound volume is stored in PRAM, so you can also try resetting PRAM.
http://support.apple.com/kb/HT1379

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